diff --git a/com.unity.ml-agents/Runtime/Sensors/SensorShapeValidator.cs b/com.unity.ml-agents/Runtime/Sensors/SensorShapeValidator.cs
index 2da5e534a4..d144913e86 100644
--- a/com.unity.ml-agents/Runtime/Sensors/SensorShapeValidator.cs
+++ b/com.unity.ml-agents/Runtime/Sensors/SensorShapeValidator.cs
@@ -26,7 +26,12 @@ public void ValidateSensors(List<ISensor> sensors)
             {
                 // Check for compatibility with the other Agents' Sensors
                 // TODO make sure this only checks once per agent
-                Debug.Assert(m_SensorShapes.Count == sensors.Count, $"Number of Sensors must match. {m_SensorShapes.Count} != {sensors.Count}");
+                Debug.AssertFormat(
+                    m_SensorShapes.Count == sensors.Count,
+                    "Number of Sensors must match. {0} != {1}",
+                    m_SensorShapes.Count,
+                    sensors.Count
+                );
                 for (var i = 0; i < Mathf.Min(m_SensorShapes.Count, sensors.Count); i++)
                 {
                     var cachedShape = m_SensorShapes[i];